This is a BUFFALO DVI-compatible computer automatic switching device (KVM switch), model BSKMD201BK. It allows you to share a mouse (USB), keyboard (PS/2), display, speakers & microphone between two computers. I opened it after purchase, but I don't remember actually connecting and using it. It has been stored at home for a long time, and I have not confirmed its operation, so please understand that it is being sold **as is (junk)**, with no operational guarantee. The outer box has many scratches, scuffs, and peeling. Please check the photos for the condition of the main unit and the presence of accessories. This product is for older operating systems, so please purchase only if you understand the specifications. I will pack it carefully, not in simple packaging, and ship it.